package com.company;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ShareResource {
    private int number = 1;
    //A :1 B:2 C:3
    private Lock lock = new ReentrantLock();
    private Condition c1 =lock.newCondition();
    private Condition c2 =lock.newCondition();
    private Condition c3 =lock.newCondition();
    public void prints5(){
        lock.lock();
        try
        {
            while(number!=1)
            {
                c1.await();
            }
            for(int i = 0; i < 5; i++)
            {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number =2;
            c2.signal();
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            lock.unlock();
        }
    }
    public void prints10(){
        lock.lock();
        try
        {
            while(number!=2)
            {
                c2.await();
            }
            for(int i = 0; i < 10; i++)
            {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number =3;
            c3.signal();
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            lock.unlock();
        }
    }
    public void prints15() {
        lock.lock();
        try {
            while (number != 3) {
                c3.await();
            }
            for (int i = 0; i < 15; i++) {
                System.out.println(Thread.currentThread().getName() + "\t" + i);
            }
            number = 1;
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public static void main(String args[]){
        final ShareResource test = new ShareResource();
        new Thread(new Runnable(){
            public void run(){
                for(int i =0 ; i < 10; i++)
                {
                    test.prints5();
                }
            }
        },"A").start();;
        new Thread(new Runnable(){
            public void run(){
                for(int i =0 ; i < 10; i++)
                {
                    test.prints10();
                }
            }
        },"B").start();
        new Thread(new Runnable(){
            public void run(){
                for(int i =0 ; i < 10; i++)
                {
                    test.prints15();
                }
            }
        },"C").start();
    }
}
